Easy 25% Increase
I just filled up today and found my city driving has improved from 32-33 mpg up to 40+ mpg. This is pretty much all attributable to pulse and glide driving, with the gliding in neutral not eoc. This is not at all extreme p & g, rather, I just use every opportunity to coast, like on slight downhill grades or rolling up to a red light. Someone following me would hardly notice. I'm pretty amazed at the improvement.
One thing to be careful of though: I was coming down out of the mountains one day, coasting a lot obviously and using the brakes to slow down for curves. I thought I was going easy on the brakes and giving them plenty of time to cool off, but then I pulled over 'cause the kids were fighting in the backseat, and I could smell the brakes. I checked the rotors and they were blue from the heat. So now I'm careful to use the engine for braking on long grades. |
northboundtrain -
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Sometimes what looks like a hypermiling oppurtunity isn't :( . CarloSW2 |
Your motor is still probably running air, so you likely ARE hypermiling if you aren't pressing the accelerator.
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parasonic -
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northboundtrain - The next time you EOC, can you report your instant MPG? Also, the next time you use engine braking (in gear, foot off the accelerator), can you report your instant MPG? That will tell us if your car is using complete fuel shutoff or not. CarloSW2 |
Im sure there is some kind of brake cooling ram air for your brakes since its a VW and they have a nice aftermarket line-up. Might lower FE a bit but look cool and keep your brakes cooler.
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What about engine off coasting in gear? This is an effective way for most EFI based manuals to engine brake. I'm not sure how well that would work out with the VW injection however.
I used to do that all of the time in my hillclimb car when descending. Due to the amount of heat buildup, it also helped to cool the motor down to a more reasonable level. (I could touch the turbine side of the turbo after a 2 mile descent.) Of course that brings up the question of efficiency on restarting since the cooling effect might result in higher initial consumption to warm up again. |
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The internal workings of injection pumps are pretty mysterious to most of us shade tree mechanics, since they require very specialized and expensive equipment to work on. We just send them out to be rebuilt/fixed. |
Wouldn't the 0% throttle position in the diesel be almost no injected fuel at an engine speed above idle since it doesn't need to care about lean burn or keeping a 14:1 air:fuel? I would think it certainly would be absolutely no worse than simple idling, but likely better.
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On my car when it goes into fuel shutoff the Scanguage shows open loop instead of closed, but the MPG does not reflect the change. |
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